Stack Under flow

[Wayne]

Hi Steve (MR. E)

Yes that did work and thank you very much for the help.
But one more thing WHY and what is a stack underflow?

Again Thanks

Wayne

[mister_e]

A short explanation:
once the program RETURN from GETKEY, it RETURN after the GOSUB line, then do once again the GETKEY sub, meet a RETURN without a previous gosub.

Gosub => stack+1 => stack = +
Return => stack-1 => stack = 0
Return +> stack-1 => stack=-1 <=== here's the underflow

[Wayne]

OK makes sence


Again Thanks for your help




Wayne